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#pragma once
#include <stdint.h>
typedef uint64_t simloop_time_t; ///< Time delta in nanoseconds.
typedef struct SimloopArgs {
int update_fps; ///< Update frame rate. Must be >0.
int max_render_fps; ///< Render frame rate cap. 0 to disable.
} SimloopArgs;
typedef struct SimloopOut {
uint64_t frame; ///< Frame counter.
simloop_time_t update_elapsed; ///< Amount of time elapsed in the simulation.
simloop_time_t update_dt; ///< Delta time for simulation updates.
simloop_time_t throttle; ///< Render throttle if max render fps is given.
double percent_frame; ///< Percent progress between this frame and
///< the next. Used for smooth animation.
bool should_update; ///< Whether the simulation should update.
} SimloopOut;
typedef struct SimloopTimeline {
simloop_time_t ddt; ///< Desired delta time.
simloop_time_t time; ///< Time point of the last simulation step.
} SimloopTimeline;
typedef struct Simloop {
simloop_time_t clock; ///< Tracks simulation time.
uint64_t frame; ///< Frame counter, number of updates done.
SimloopTimeline update; ///< Update timeline.
simloop_time_t render_ddt; ///< Desired render delta time.
} Simloop;
/// Create a simulation loop.
Simloop simloop_make(const SimloopArgs*);
/// Step the simulation loop.
///
/// The simulation always triggers a render of the initial state of simulation.
void simloop_update(Simloop*, simloop_time_t dt, SimloopOut*);
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